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问题：
[单选题]总线的异步通信方式______。
A、不采用时钟信号，只采用握手信号
B、既采用时钟信号，又采用握手信号
C、既不采用时钟信号，又不采用握手信号
D、既采用时钟信号，又采用握手信号
参考答案：
A
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